Sentinel D-Box Twin Fans

Duct Sizes 100 – 500mm
Performance - Airflow 0.01 to 1.2m³/s, Pressure up to 650Pa
Sentinel demand ventilation fan controller with lockable isolator
Latest low energy EC/DC motors
Acoustically treated ‘O’ class rated insulation
Backward curved impellers
Internal or external models (IPX2 or IPX5)
Manufactured controlled to BS EN ISO 9001
Performance tested to BS848 Part 1 & 2
 

The Sentinel Twin in-line duct fans are as supplied from Vent-Axia Ltd. Manufactured from prime quality galvanised sheet steel, Sentinel fan units are internally treated with an ‘O’ class rated, BS476 part 6 & 7, acoustic foam, which offers the benefits of high soundabsorption, good thermal insulation properties in addition to self extinguishing properties and resistant to ignition.

The housing is designed to be as compact as possible for concealed false ceiling applications and Sentinel casings re specially designed to allow the unit to be mounted via its unique mounting bracket, ensuring a quick and easy solution to installation.

The unit is suitable for ceiling or floor mounting, non-return dampers can be easily rotated on site to suit.

Applications

Impellers
All Sentinel units feature a low energy, Class 1, EC/DC external rotor motor and backward curved impeller assembly specifically chosen for performance and nonoverloading characteristics. The assembly is dynamically balanced to DIN ISO 1940 Grade 6.3, motor size 500mm rated IP54, all other sizes, IP44 according to BS EN 60529. Ball bearings are greased for life. Insulation is Class 'B' (from -25°C to +60°C).

All models incorporate internal electronic overload protection and soft start function.

Electrical
Every Sentinel unit is fitted with a purpose designed common PCB controller incorporating a 16-character backlit alphanumerical x 2 line display with 4 button membrane keypad for fan status and commissioning set up. The enclosure is fitted with a 4-pole 10A isolator that is suitable for fitting a locking device to prevent accidental operation.

Motors are single phase 230V +/- 10% / 50/60Hz / 1ph (size 100-400mm) or 400V +/- 10% / 50/60Hz / 3ph (size 500mm), (4 wire systems only).

The twin unit controller features automatic 6hr duty/share and run/standby in the event of motor failure.

24V DC power is provided from the controller for powering the matched range of Sentinel switches and sensors.

Performance/Sound
Extensively tested to BS848 parts 1 & 2. Published dB(A) figures are free field sound pressure levels at 3m with spherical propagation at reference level of 2 x 10-5 Pa. The inlet/outlet sound power level spectra figures are dB with a reference of 10–12 watts.

Weatherproof Typical Ordering Designation
Ordering Codes are similar to existing units with Suffix.... /WP which denotes Weatherproof finish.

Example: SENT100S/CP/WP

Accessories
For duct accessories see Ducting and Fitting Section.

DIMENSIONS:

Hierarchy Model Constant Pressure Model a b c d e f g Weight Kg
100T 100T/CP 610 705 100 591 717 256 622 26
125T 125T/CP 610 705 125 591 717 256 622 26
150T 150T/CP 610 705 150 591 717 256 622 26
200T 200T/CP 801 896 200 703 830 343 734 39
250T 250T/CP 925 1020 250 798 925 354 829 48
315T 315T/CP 1255 1353 315 1145 1272 536 1176 88
400T 400T/CP 1255 1353 400 1145 1272 536 1176 90
500T 500T/CP 1492 1590 500 1533 1661 675 1564 175
Image of Ambient Response Humidity Sensor (Sentinel)
Ambient Response Humidity Sensor (Sentinel)
Humidity Sensor control is fixed at 72 - 75%RH. Incorporates a night time ‘set back’ function to avoid nuisance tripping as the humidity level rises when the air cools. An integral pullcord provides a manual override function if required. Can be wired for either On/Off or Trickle Boost operation. Pullcord override and neon indicator. Changeover relay switch. Operating range: 30% - 90%RH. Ambient operating temperature +5°C to +40°C. 24V DC SELV. Dimensions:87 x 87 x 33mm (H x W x D). Will fit single gang box for surface mounting.
Please call 0344 856 0590 for further availability information.
Image of Ecotronic Humidity Sensor (Sentinel)
Ecotronic Humidity Sensor (Sentinel)
Humidity Control is automatic and can be set to switch between 65 and 90%RH. An integral pullcord provides a manual override function if required. Can be wired for either ON/OFF or Trickle Boost operation. Set Point adjustable. Maximum switching load 1 amp inductive. Pullcord override indicator Ambient operating temperature 0°C to +40°C. Dimensions:87 x 87 x 33mm (H x W x D). Supply voltage 24V DC SELV. Humidity sensors should be sited approx. 100mm below ceiling level and not above cupboards, refer to siting details in fitting and wiring instructions supplied with product.
Please call 0344 856 0590 for further availability information.
Image of Air Quality Sensor (Sentinel)
Air Quality Sensor (Sentinel)
Automatically reacts to the deterioration of air quality, sensing tobacco smoke, smells and toilet odours to regulate mechanically ventilated areas, such as cinemas, pubs, clubs, restaurants, kitchens, toilets and conference rooms. The sensor switches when the air quality declines below an adjustable preset level. This is registered by a self-cleaning ceramic sensing head. The air quality sensor should not be used for the detection of combustible gases. Ambient operating temperature range 0°C to +50°C. MIN - MAX mode or direct Damper control. Dimensions:87 x 157 x 47mm (H xWxD) Surface mounted. 1 - 25 min O/R timer. Supply voltage 24V DC SELV.
Please call 0344 856 0590 for further availability information.
Image of Thermo Switch
Thermo Switch
Automatically switches on fans on either a rise or fall in air temperature. Can be used for Trickle/ Boost operation on either intake or extract systems. Setting range: +6°C to +30°C. Two internal range limit/locking rings are included to allow setting within a limited temperature range or locking at a fixed set-point. IP20 rated. Sealed sensing mechanism. Mounting direct on surface only. Dimensions: 80 x 104 x 36mm (H x W x D).
Please call 0344 856 0590 for further availability information.
Image of Visionex PIR (Sentinel)
Visionex PIR (Sentinel)

A wall or ceiling person presence detector for use with Sentinel. Can be used in MIN - MAX mode or for direct damper control. Fits any UK single gang mounting box. Adjustable timer overrun (5-25 minutes). Range of detection up to 10 metres. Designed to meet IP43. Ambient operating temperature range 0°C to +50°C. Supply voltage 24V DC SELV.

Please call 0344 856 0590 for further availability information.
Image of Remote Speed Control (Sentinel)
Remote Speed Control (Sentinel)
Provides infinitely variable Sentinel fan speed control between the 2 set points in Proportional mode. This control does NOT provide an ON/OFF switching facility. Manual control. located remotely. 24V DC SELV. Ambient operating temperature -5°C to +40°C. Dimensions:84 x 84 x 30mm (H x W x D). Will fit single gang box for surface mounting.
Please call 0344 856 0590 for further availability information.
Image of CO2 Duct Sensor (Sentinel)
CO2 Duct Sensor (Sentinel)
High CO2 levels promote increased fatigue and reduced concentration. Sensor monitors CO2 level in extract ducts from conference areas, offices, theatres etc. With Sentinel in Proportional control mode, air extraction rate tracks the CO2 level to improve indoor air quality. 24V DC SELV, 0 - 2000ppm CO2 working range. Auto-calibrating NDIR absorption sensor. Stable drift compensation. Adjustable probe length. IP Rating 65.
Please call 0344 856 0590 for further availability information.
Image of CO2 + Temp Room Sensor (Sentinel)
CO2 + Temp Room Sensor (Sentinel)
HVAC temperature and carbon dioxide room sensor for ventilation control of residential areas, office areas and classrooms. Used with Sentinel in Proportional control mode. Sensor will monitor both CO2 and temperature levels between the set points, the Sentinel air extraction rate will follow the higher of the 2 outputs. 24V DC SELV. 0 - 2000ppm CO2 working range. 0 - 50°C Temperature working range. Auto-calibrating NDIR CO2 absorption sensor. Thin film platinum temperature sensor for high accuracy. Dimensions:100 x 84 x 25mm (H x W x D).
Please call 0344 856 0590 for further availability information.
Image of Sentinel Remote Status Indicator
Sentinel Remote Status Indicator
This Remote Display unit will indicate the running status and condition of the fan or fans. Can be used in all Sentinel operating modes for fan mounting. 24V DC SELV. Directly connects into the Sentinel Control Unit. Used for single and twin fan mounting. Ambient operating temperature -5°C to +50°C. Dimensions:86 x 86 x 28mm (H x W x D).
Please call 0344 856 0590 for further availability information.
Image of Sentinel Costant Pressure PIR Grille
Sentinel Costant Pressure PIR Grille
PIR grille is on extract grille with an integral flap damper. Suitable for bathrooms and WC’s. The PIR function fully opens the damper when a person presence is detected. The opening time is fixed at 20 mins. Spigot size is 125mm. 12V AC SELV unit using the main transformer unit supplied. Integral PIR person presence sensor controlling damper - 100° viewing angle. Autohumidity control damper response at all times. Temperature range 0 - 50°C . Size: 158 x 150 x 35mm (H x W x D). MAX airflow 70m3/hr @100 Pa.
Please call 0344 856 0590 for further availability information.
Image of Sentinel Constant Pressure System Dampers
Sentinel Constant Pressure System Dampers
Two types available for Sentinel CP Systems: MM - opening shut/MIN to open/MAX controlled by switches PC - opening proportionally when controlled by 0-10V sensors. Duct sizes available: 100, 125, 150, 200, 250 and 315. Industry standard actuators. Typical ordering designation: DVD size MM or PC
Please call 0344 856 0590 for further availability information.
Image of Power Supply 24V DC SELV (Sentinel)
Power Supply 24V DC SELV (Sentinel)
For those situations where a separate 24V DC SELV supply source is required. (Will power up to 5 Sentinel Dampers) 24W output capacity.
Please call 0344 856 0590 for further availability information.
Image of AirTrack Duct Air Heater - with Controls
AirTrack Duct Air Heater - with Controls
The Vent-Axia range of sheathed element air duct heaters with built in control system provide a safe method of air heating which is economical to install and operate. Circular Duct Air Heaters comprising of electric resistance elements, mounted in a pregalvanised steel casing. Every heater is fitted with a high temperature safety cut out operating at 120°C complete with push button manual reset. Available in 100, 125, 150, 200, 250, 315 and 400mm diameter sizes. The air velocity across the heater elements must be greater than 2m/s and installed a minimum distance of one metre from the exhaust outlet of the fan unit. All fans supplying heaters above 6 kW should be fitted with an off-delay timer to dissipate any residual heat when the system is shut down. Duct heaters must be used in conjunction with a fan heater controller and a temperature thermostat (room or duct) and an air pressure/flow switch.
Please call 0344 856 0590 for further availability information.

Overview

The Sentinel Twin in-line duct fans are as supplied from Vent-Axia Ltd. Manufactured from prime quality galvanised sheet steel, Sentinel fan units are internally treated with an ‘O’ class rated, BS476 part 6 & 7, acoustic foam, which offers the benefits of high soundabsorption, good thermal insulation properties in addition to self extinguishing properties and resistant to ignition.

The housing is designed to be as compact as possible for concealed false ceiling applications and Sentinel casings re specially designed to allow the unit to be mounted via its unique mounting bracket, ensuring a quick and easy solution to installation.

The unit is suitable for ceiling or floor mounting, non-return dampers can be easily rotated on site to suit.

Applications

Impellers
All Sentinel units feature a low energy, Class 1, EC/DC external rotor motor and backward curved impeller assembly specifically chosen for performance and nonoverloading characteristics. The assembly is dynamically balanced to DIN ISO 1940 Grade 6.3, motor size 500mm rated IP54, all other sizes, IP44 according to BS EN 60529. Ball bearings are greased for life. Insulation is Class 'B' (from -25°C to +60°C).

All models incorporate internal electronic overload protection and soft start function.

Electrical
Every Sentinel unit is fitted with a purpose designed common PCB controller incorporating a 16-character backlit alphanumerical x 2 line display with 4 button membrane keypad for fan status and commissioning set up. The enclosure is fitted with a 4-pole 10A isolator that is suitable for fitting a locking device to prevent accidental operation.

Motors are single phase 230V +/- 10% / 50/60Hz / 1ph (size 100-400mm) or 400V +/- 10% / 50/60Hz / 3ph (size 500mm), (4 wire systems only).

The twin unit controller features automatic 6hr duty/share and run/standby in the event of motor failure.

24V DC power is provided from the controller for powering the matched range of Sentinel switches and sensors.

Performance/Sound
Extensively tested to BS848 parts 1 & 2. Published dB(A) figures are free field sound pressure levels at 3m with spherical propagation at reference level of 2 x 10-5 Pa. The inlet/outlet sound power level spectra figures are dB with a reference of 10–12 watts.

Weatherproof Typical Ordering Designation
Ordering Codes are similar to existing units with Suffix.... /WP which denotes Weatherproof finish.

Example: SENT100S/CP/WP

Accessories
For duct accessories see Ducting and Fitting Section.

Technical

DIMENSIONS:

Hierarchy Model Constant Pressure Model a b c d e f g Weight Kg
100T 100T/CP 610 705 100 591 717 256 622 26
125T 125T/CP 610 705 125 591 717 256 622 26
150T 150T/CP 610 705 150 591 717 256 622 26
200T 200T/CP 801 896 200 703 830 343 734 39
250T 250T/CP 925 1020 250 798 925 354 829 48
315T 315T/CP 1255 1353 315 1145 1272 536 1176 88
400T 400T/CP 1255 1353 400 1145 1272 536 1176 90
500T 500T/CP 1492 1590 500 1533 1661 675 1564 175

Accessories

Image of Ambient Response Humidity Sensor (Sentinel)
Ambient Response Humidity Sensor (Sentinel)
Humidity Sensor control is fixed at 72 - 75%RH. Incorporates a night time ‘set back’ function to avoid nuisance tripping as the humidity level rises when the air cools. An integral pullcord provides a manual override function if required. Can be wired for either On/Off or Trickle Boost operation. Pullcord override and neon indicator. Changeover relay switch. Operating range: 30% - 90%RH. Ambient operating temperature +5°C to +40°C. 24V DC SELV. Dimensions:87 x 87 x 33mm (H x W x D). Will fit single gang box for surface mounting.
Please call 0344 856 0590 for further availability information.
Image of Ecotronic Humidity Sensor (Sentinel)
Ecotronic Humidity Sensor (Sentinel)
Humidity Control is automatic and can be set to switch between 65 and 90%RH. An integral pullcord provides a manual override function if required. Can be wired for either ON/OFF or Trickle Boost operation. Set Point adjustable. Maximum switching load 1 amp inductive. Pullcord override indicator Ambient operating temperature 0°C to +40°C. Dimensions:87 x 87 x 33mm (H x W x D). Supply voltage 24V DC SELV. Humidity sensors should be sited approx. 100mm below ceiling level and not above cupboards, refer to siting details in fitting and wiring instructions supplied with product.
Please call 0344 856 0590 for further availability information.
Image of Air Quality Sensor (Sentinel)
Air Quality Sensor (Sentinel)
Automatically reacts to the deterioration of air quality, sensing tobacco smoke, smells and toilet odours to regulate mechanically ventilated areas, such as cinemas, pubs, clubs, restaurants, kitchens, toilets and conference rooms. The sensor switches when the air quality declines below an adjustable preset level. This is registered by a self-cleaning ceramic sensing head. The air quality sensor should not be used for the detection of combustible gases. Ambient operating temperature range 0°C to +50°C. MIN - MAX mode or direct Damper control. Dimensions:87 x 157 x 47mm (H xWxD) Surface mounted. 1 - 25 min O/R timer. Supply voltage 24V DC SELV.
Please call 0344 856 0590 for further availability information.
Image of Thermo Switch
Thermo Switch
Automatically switches on fans on either a rise or fall in air temperature. Can be used for Trickle/ Boost operation on either intake or extract systems. Setting range: +6°C to +30°C. Two internal range limit/locking rings are included to allow setting within a limited temperature range or locking at a fixed set-point. IP20 rated. Sealed sensing mechanism. Mounting direct on surface only. Dimensions: 80 x 104 x 36mm (H x W x D).
Please call 0344 856 0590 for further availability information.
Image of Visionex PIR (Sentinel)
Visionex PIR (Sentinel)

A wall or ceiling person presence detector for use with Sentinel. Can be used in MIN - MAX mode or for direct damper control. Fits any UK single gang mounting box. Adjustable timer overrun (5-25 minutes). Range of detection up to 10 metres. Designed to meet IP43. Ambient operating temperature range 0°C to +50°C. Supply voltage 24V DC SELV.

Please call 0344 856 0590 for further availability information.
Image of Remote Speed Control (Sentinel)
Remote Speed Control (Sentinel)
Provides infinitely variable Sentinel fan speed control between the 2 set points in Proportional mode. This control does NOT provide an ON/OFF switching facility. Manual control. located remotely. 24V DC SELV. Ambient operating temperature -5°C to +40°C. Dimensions:84 x 84 x 30mm (H x W x D). Will fit single gang box for surface mounting.
Please call 0344 856 0590 for further availability information.
Image of CO2 Duct Sensor (Sentinel)
CO2 Duct Sensor (Sentinel)
High CO2 levels promote increased fatigue and reduced concentration. Sensor monitors CO2 level in extract ducts from conference areas, offices, theatres etc. With Sentinel in Proportional control mode, air extraction rate tracks the CO2 level to improve indoor air quality. 24V DC SELV, 0 - 2000ppm CO2 working range. Auto-calibrating NDIR absorption sensor. Stable drift compensation. Adjustable probe length. IP Rating 65.
Please call 0344 856 0590 for further availability information.
Image of CO2 + Temp Room Sensor (Sentinel)
CO2 + Temp Room Sensor (Sentinel)
HVAC temperature and carbon dioxide room sensor for ventilation control of residential areas, office areas and classrooms. Used with Sentinel in Proportional control mode. Sensor will monitor both CO2 and temperature levels between the set points, the Sentinel air extraction rate will follow the higher of the 2 outputs. 24V DC SELV. 0 - 2000ppm CO2 working range. 0 - 50°C Temperature working range. Auto-calibrating NDIR CO2 absorption sensor. Thin film platinum temperature sensor for high accuracy. Dimensions:100 x 84 x 25mm (H x W x D).
Please call 0344 856 0590 for further availability information.
Image of Sentinel Remote Status Indicator
Sentinel Remote Status Indicator
This Remote Display unit will indicate the running status and condition of the fan or fans. Can be used in all Sentinel operating modes for fan mounting. 24V DC SELV. Directly connects into the Sentinel Control Unit. Used for single and twin fan mounting. Ambient operating temperature -5°C to +50°C. Dimensions:86 x 86 x 28mm (H x W x D).
Please call 0344 856 0590 for further availability information.
Image of Sentinel Costant Pressure PIR Grille
Sentinel Costant Pressure PIR Grille
PIR grille is on extract grille with an integral flap damper. Suitable for bathrooms and WC’s. The PIR function fully opens the damper when a person presence is detected. The opening time is fixed at 20 mins. Spigot size is 125mm. 12V AC SELV unit using the main transformer unit supplied. Integral PIR person presence sensor controlling damper - 100° viewing angle. Autohumidity control damper response at all times. Temperature range 0 - 50°C . Size: 158 x 150 x 35mm (H x W x D). MAX airflow 70m3/hr @100 Pa.
Please call 0344 856 0590 for further availability information.
Image of Sentinel Constant Pressure System Dampers
Sentinel Constant Pressure System Dampers
Two types available for Sentinel CP Systems: MM - opening shut/MIN to open/MAX controlled by switches PC - opening proportionally when controlled by 0-10V sensors. Duct sizes available: 100, 125, 150, 200, 250 and 315. Industry standard actuators. Typical ordering designation: DVD size MM or PC
Please call 0344 856 0590 for further availability information.
Image of Power Supply 24V DC SELV (Sentinel)
Power Supply 24V DC SELV (Sentinel)
For those situations where a separate 24V DC SELV supply source is required. (Will power up to 5 Sentinel Dampers) 24W output capacity.
Please call 0344 856 0590 for further availability information.
Image of AirTrack Duct Air Heater - with Controls
AirTrack Duct Air Heater - with Controls
The Vent-Axia range of sheathed element air duct heaters with built in control system provide a safe method of air heating which is economical to install and operate. Circular Duct Air Heaters comprising of electric resistance elements, mounted in a pregalvanised steel casing. Every heater is fitted with a high temperature safety cut out operating at 120°C complete with push button manual reset. Available in 100, 125, 150, 200, 250, 315 and 400mm diameter sizes. The air velocity across the heater elements must be greater than 2m/s and installed a minimum distance of one metre from the exhaust outlet of the fan unit. All fans supplying heaters above 6 kW should be fitted with an off-delay timer to dissipate any residual heat when the system is shut down. Duct heaters must be used in conjunction with a fan heater controller and a temperature thermostat (room or duct) and an air pressure/flow switch.
Please call 0344 856 0590 for further availability information.

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